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Genetic Diversity of Three European Veratrum Species Revealed by Amplified Fragment Length Polymorphism

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Genetic Diversity of Three European Veratrum Species Revealed by Amplified Fragment Length Polymorphism Biodiv. Res. Conserv. 47: 1-8, 2017 BRC www.brc.amu.edu.pl DOI 10.1515/biorc-2017-0011 Submitted 13.06.2017, Accepted 30.09.2017 Genetic diversity of three European Veratrum species revealed by Amplified Fragment Length Polymorphism Magdalena Szeliga*, Joanna Ciura & Mirosław Tyrka Department of Biotechnology and Bioinformatics, Faculty of Chemistry, Rzeszow University of Technology, Powstańców Warszawy 6, 35-959 Rzeszów, Poland *corresponding author (e-mail: [email protected]) Abstract. Chemical and genetic characterization of Veratrum species deposited in European collections is important for genepool preservation and identification of populations with desired metabolic properties.Veratrum album, V. lobelianum and V. nigrum are native to Europe, and in Poland are ranked as rare or threatened. Genetic variation of European Veratrum species was characterized by Amplified Fragment Length Polymorphism (AFLP) markers. The accumulation of jervine as a represen- tative of steroidal alkaloids was measured in seeds. Distribution of 380 markers generated from eight primer combinations was useful for studying genetic relationships among and within species in the Veratrum genus and the most divergent populations were identified. Genetic variation between 12 populations ofVeratrum species supports the classification ofV. lobelianum as a subspecies of V. album. However, the results need further validation on extended material. A higher genetic diversity (22.3%) was observed between populations of V. nigrum as compared to V. album (14.5%). Contents of jervine allowed for discrimina- tion of the studied Veratrum species and can be used as a potential chemotaxonomic marker. The highest jervine levels were found in V. album. V. nigrum seeds had only trace amounts and no jervine was detected in seeds of V. lobelianum. Key words: genetic variation, hellebore, jervine, Melanthiaceae, molecular markers 1. Introduction are divided according to structural features (Li et al. 2006). These steroidal alkaloids are well known for The Veratrum genus (Liliales, Melanthiaceae) com- their pharmacological activities, including hypotensive, prises 17-45 species distributed over a wide range of antithrombotic and antitumour functions (Tang et al. habitats of the Northern Hemisphere (Zomlefer et al. 2008a; Ivanova et al. 2011). In particular, cyclopamine 2003; Treier & Müller-Schärer 2011). Veratrum album showed antitumour activity and induced apoptosis using L., Veratrum lobelianum Bernh. and Veratrum nigrum the mechanism of inhibition of the hedgehog pathway in L. are native to Europe. Only a few isolated populations a subset of the pancreatic cancer cell line (Thayer et al. of these species are present in Poland and ranked as rare 2003). Due to low cyclopamine concentration in Vera- or threatened (Allen et al. 2014). Veratrum album sensu trum plants (about 0.01%), we focussed our attention on lato is a complex of subspecies V. album ssp. album jervine that was present in higher concentrations (0.1%) and V. album ssp. lobelianum (Schaffner et al. 2001) and can be transformed to cyclopamine by Wolff-Kish- sometimes considered as separate species (Zomlefer et ner reduction with Huang-Minlon modification (Tanget al. 2003). Plants of Veratrum are a rich source of unique al. 2008b). Jervine displays strong antifungal activities bioactive steroidal alkaloids (Chandler & McDougal against the phytopathogenic Phytophthora capsici (Li 2014). Quantitative and qualitative variations in the et al. 2006). metabolic profile and pharmacological properties are Medical plants from Melanthiaceae are interest- affected by environmental factors and genetic diversity ing specimens for genetic diversity studies (Li et al. present in natural populations (Li et al. 2015). 2011; Treier & Müller-Schärer 2011). For genetic There are three subtypes of Veratrum-type alka- characteristics targeting taxonomic questions, variation loids including cevanine, veratramine and jervine that in cpDNA and the internal transcribed spacer (ITS) AND PHYLOGENY TAXONOMY VARIABILITY, ©Adam Mickiewicz University in Poznań (Poland), Department of Plant Taxonomy. All rights reserved. 2 Magdalena Szeliga et al. Genetic diversity of three European Veratrum species revealed by amplified fragment... region of rDNA are standard (Zomlefer et al. 2003; 2. Materials and methods Griffin & Barrett 2004; Liao et al. 2007). Systems targeting conservative regions of DNA were ideal 2.1. Plant materials for separating evolutionary different populations of Trillium grandiflorum and V. album ssp. oxysepalum Plant collection consisted of six populations of (Griffin & Barrett 2004; Kikuchiet al. 2010). However, V. nigrum, five populations of V. album and a single to study genetic diversity within and between natural population of V. lobelianum maintained in botanical gar- populations, amplified fragment length polymorphism dens across seven European countries (Table 1). Seeds (AFLP) system is a method of choice (Guthridge et al. from population N5 (V. nigrum) were germinated and 2001; Quagliaro et al. 2001; Tang et al. 2003; Llanes plants were maintained in vitro, then lyophilized prior et al. 2011). This DNA fingerprinting technique targets to DNA extraction. Seeds of the remaining families had multiple loci, generates dominant markers for whole- reduced viability and, therefore, were used directly (3-7 genome screening and has higher reproducibility, reso- random seeds) for DNA isolation. The names of genus lution, and sensitivity compared to random amplified and species follow Zomlefer et al. (2003). polymorphic DNA (RAPD) and inter simple sequence 2.2. DNA extraction and AFLP analysis repeats (ISSRs) methods (Vos et al. 1995; Blears et al. 1998). Total plant genomic DNA was extracted from seeds Various genetic marker systems have been used to or lyophilized plants using a method developed by Mil- characterize variation in the Veratrum genus, including ligan (1992). The DNA was quantified using agarose RAPD (Kleijn & Steinger 2002), AFLP (Treier & Mül- gel electrophoresis and diluted to a concentration of ler-Schärer 2011) and simple sequence repeats (Kato et 200 ng·mL-1 prior to AFLP analysis. The AFLP analysis al. 2008; Kikuchi & Maki 2011). AFLP studies of 40 was carried out according to the methods of Thomas et European natural populations of V. album revealed east- al. (1995). Genomic DNA was digested with MseI and west direction in the genetic structure and suggested PstI restriction enzymes (5 U each) in Tango buffer (33 ancient migration from Asia (Treier & Müller-Schärer mM Tris-acetate, pH 7.9 at 37°C; 10 mM magnesium 2011). acetate; 66 mM potassium acetate; 0.1 mg/ml BSA) for So far, genetic diversity between and within European 90 min at 65°C and 60 min at 37°C, respectively. The accessions of V. nigrum, V. album and V. lobelianum has enzymes were subsequently heat inactivated at 80°C not been investigated with AFLP markers. Chemical and for 20 min and the products ligated with MseI and PstI genetic characterization of Veratrum species deposited adapters overnight at 37°C to generate template DNA in European collections generates new information for amplification. DNA was then purified by ethanol pre- useful both for genepool preservation and for identifica- cipitation and dissolved in 20 µL of water. Non-selective tion of populations with desired metabolic properties. (NS) amplification (30 cycles of 30 s at 94°C, 30 s at Jervine content was determined to preliminary test the 56°C and 60 s at 72°C) was conducted using primers suitability of this genera-specific steroid alkaloid as a complementary to MseI and PstI adaptors without potential chemotaxonomic marker. selective nucleotides (5'-GATGAGTCCTGAGTAA-3' Table 1. Populations of Veratrum species used for genetic and chemical analyses Number Acronym Species Sampling locality Source of material of plants N1 V. nigrum Nowy Sącz, POL Private garden 3 N2 V. nigrum Ljubljana, SVN University Botanic Gardens 7 N3 V. nigrum Bayreuth, DEU Ecological Botanical Gardens 5 N4 V. nigrum Romsey, GBR Sir Harold Hillier Gardens 5 N5 V. nigrum Brno, CZE Masaryk University Botanic Garden 6 N6 V. nigrum Yoskar-Ola, RUS Botanical Garden of the Technological State University 5 L1 V. lobelianum Ljubljana, SVN University Botanic Gardens 6 A1 V. album Bayreuth, DEU Ecological Botanical Gardens 5 A2 V. album Bolestraszyce, POL Arboretum and Institute of Physiography 6 A3 V. album Bonn, DEU University Botanic Gardens 6 A4 V. album Nancy, FRA Conservatory and Botanical Gardens 4 A5 V. album High Tatra Mts, POL Collecting 6 Biodiv. Res. Conserv. 47: 1-8, 2017 3 and 5'-GACTGCGTACATGCAG-3', respectively). following transitions were detected: m/z 425.89/313.10 The diluted PCR products of the NS amplification were Da and 425.89/114.0 Da for jervine (Tang et al. 2008b; selectively amplified with eight combinations of MseI Grobosch et al. 2008). primers (M43, M47, M48, M50, M59) and PstI primers 2.4. Data analysis (P4, P12, P15, P16, P18, P26, P34), each containing three selective nucleotides at the 3'-end. Symbols of the For the diversity analysis, the amplification products selective primers are in accordance with the KeyGene were scored for the presence (1) and absence (0) of standard list for AFLP primer nomenclature. Selective bands to form a binary matrix. These data were used amplification was accomplished with a touchdown to calculate polymorphism information, including the thermal cycle, as follows: 7 cycles at 94°C for 60 s, 65°C number of polymorphic/species-specific fragments
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